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Debt - Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Debt Instrument [Roll Forward]        
Amortization of debt issuance costs     $ 112 $ 74
Change in fair value of embedded derivative $ 5,482 $ 1,235 9,519 $ (188)
Notes        
Debt Instrument [Roll Forward]        
Embedded conversion option, beginning balance     16,736  
2033 Senior Notes, beginning balance     31,850  
Discount, beginning balance     (4,612)  
Debt issuance cost, beginning balance     (273)  
Total, beginning balance     43,701  
Amortization of debt discount     997  
Amortization of debt issuance costs     74  
Amortization of debt discount and debt issuance costs     1,071  
Change in fair value of embedded derivative     (10,014)  
Embedded conversion option, ending balance 6,722   6,722  
2033 Senior Notes, ending balance 31,850   31,850  
Discount, ending balance (3,615)   (3,615)  
Debt issuance cost, ending balance (199)   (199)  
Total, ending balance $ 34,758   $ 34,758